关键词: 风力发电, 限功率控制, 桨距角控制, 转移轨迹优化, 机械疲劳

Abstract: To realize the dispatching orders, the pitch angle and rotor speed of variable-speed variable-pitch wind turbine generator need to be adjusted, when running in the wind power curtailment regions. In order to reduce the fatigue degree of mechanical parts, it is necessary to avoid adjusting the pitch angle in the process of curtailment power control. However, the commonly used curtailment control strategy based on simple speed priority may not be able to reduce the amplitude and frequency of pitch angle effectively. A dual optimal coordinated curtailment control strategy is proposed in this paper. With the objective of minimizing the adjustment of the generator speed and pitch angle, the first optimization is carried out. Then, with the objective of reducing the adjustment of regulating frequency of the pitch angle, the second optimization is built on the basis of the first one. The mechanical fatigue degree of pitch angle is improved by the optimal coordinated control of the wind turbine and generator. At last, the proposed control strategy is validated on a simulation platform for doubly-fed wind generator. The results show that the proposed control strategy has good performance on reducing the adjustment of pitch angle and mechanical wear. Correspondingly, the proposed method can reduce the mechanical wear and prolong life of wind turbine generators.

Key words: wind power generation, power curtailment control, pitch angle control, optimization of transfer trajectory, mechanical fatigue